Oct 2026· Zenodo (CERN European Organization for Nuclear Research)
Ionosphere and magnetosphere dynamics
Abstract
This MATLAB package calculates finite-time diffusion coefficients for proton interactions with monochromatic magnetosonic waves in a dipole magnetic field. The model uses a single-harmonic, weak-wave approximation and includes gradient–curvature drift in both the wave–particle phase evolution and electromagnetic coupling. Users can specify the wave-normal angle, azimuthal wave-vector projection, and particle energy and equatorial pitch angle. Outputs include energy, pitch-angle, and L-shell diffusion coefficients and their cross terms. The package contains the core solver, basic plotting functions, and a README with usage instructions.
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